The complete evolutionary works of Charles Darwin have gone online, including the stolen notebook he carried in his pocket around the Galapagos Islands.
Tens of thousands of pages of text and pictures and audio files have been made available, including some previously unpublished manuscripts and diaries of the great British scientist.
Among the unique collection is the notebook used during the Beagle voyage, which would later forge his scientific arguments. It was stolen in the 1980s, but Darwin's great-great-grandson hopes that the publication online, thanks to a transcription from a microfilm copy made two decades earlier, will persuade whoever has it to return it.
John van Wyhe, director of the project run by Cambridge University, said the collection is so comprehensive, it will help dispel the "many misconceptions and myths" about the naturalist.
Further writings will be added to the Complete Works of Darwin Online during the next three years to coincide with the bicentenary of Darwin's birth.